Filter cartridge



FIG. 1 is a elevational view of a filter cartridge showing my new design;

FIG. 2 is a top plan view thereof; and

FIG. 3 is a bottom plan view thereof.

The 4 teardrop-shaped elements shown on the inside of the bottom half of the filter are equally spaced around the inside thereof, as indicated from the bottom plan view in FIG. 3. 

The ornamental design for a filter cartridge, as shown and described. 